Door-lock.



W. c. E J. ML THORPE.

DOOR LOCK.

APPLIUATION FILED MAY z2. 1909,

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Patented Aug. 16, 1910.`

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Patented Aug. 16, 1910.

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UNITED STATES PATENT OFFICE.

WILLIAM C. THOR/PE AND JOSEPH 1VI. THORPE, OF FRUITVALE, CALIFORNIA.

DOOR-LOCK.

Specification of Letters Patent. Patented Aug, 16s 1910, Application filed May 22, 1909.

Serial No. 497,738.

To all whom it may concern:

Be it known that we, WiLLIAM C. Tnonrn and Josnrrr M. Trionrn, both citizens of the United States, residing at Fruitvale, in the county of Alameda and State of California, have invented new and useful Improvements in Door-Locks, of which the following is a specification.

Our invention relates to door locks. Its object is to provide a simple, practical door lock which can be manipulated from either the inside or the outside of the door when desired, which can be locked through "the knob from the outside and still work from the inside, and which can be locked from the inside so that it cannot be worked from the Outside.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings, in whichh Figure 1 is a plan View in partial section of the lock with the latch bolt retracted. Fig. 2 is a similar view of the bolt in normal position with the door locked from the outside. Fig. 3 is an end view of the knob shank. Fig. 4 is a perspective of the latch bolt barrel or casing. Fig. 5 is a plan view in partial section taken through the barrel showing the latch bolt mechanism. Fig. 6 is a perspective of the outside knob and tumbler mechanism. Fig. 7 is a plan in partial section representing a modified form of tum A represents the outside knob and B the inside knob suitably connected together through the door by a polygonal knob spindle 2 which Afits a collar 3 having a corresponding bore, and which collar is loosely mounted in the casing or barrel 4 which houses the latch bolt 5; the collar 3 having the cam shoulders 6 adapted to engage the projections or lugs 7 on the forked inner end of the latch bolt. The latter is projected normally outward into operative position to engage a keeper' on the doorj amb, by suitable means, as the springs 8. Springs 9 act on the collar 3 normally to hold it with its cams 6 in neutral position with respect to the lugs 7, so as to allow the springs `8 to act on the latch bolt to project it outward into operative position. Manifestly by turn` ing either of the knobs A-B in either direction, the cam shoulders 6 will engage one or other of the lugs 7 on the latch bolt and retract the latter. Releasing the pressure on the knobs permits the springs 8 to again project the latch bolt outward as described.

In order to lock the knobs from turning we provide a tumbler plate 10 of suitable construction suitably housed in a chamber formed in the outside end of the knob shank, and which tumbler plate 10 has a tumbler member 11 adapted to slide back and forth lengthwise of the knob shank, according to the manner in which the key 12 is turned;

this key being adapted to fit into a radially extending keyhole 13 in the outside knob A. The key 12 is of suitable construction and is adapted when inserted into the keyhole 13 to engage a locking plate 14 pivoted at 15 to the tumbler plate 10. This locking plate 14 is slotted, as shown at 16, and has a projection 17 on one side extending into the slot and adapted to engage on one side or the other of a lug 18 which is rigid with the knob shank and is immovable, but which projects through a longitudinal slot 19 in the tumbler plate 10. The free end of the locking plate 14 has a projection 20 extending into the path of the key 12; and tumbler plate 10 has a notch 20 to receive and engage with the key; so that by turning the key either way the locking plate will be moved, lirst, to disengage the projection 17 from the lug 18, and secondly, the tumbler plate l() will be reciprocated. A spring 21 acts normally to press the end 20 toward the key and to cause the projection 17 to engage on one side or the other of the Xed guide lug 18. Thus in Fig. 1, the key having been turned to retract the tumbler member, the fixed guide lug 18 stands in front of the projection 17, so that the knobs can be turned and the bolt retracted. In Fig. 2, on the other hand, the key has been turned to move the tumbler into the lock to prevent the retraction of the latch bolt, as will be shortly described, and the fixed lug 18 stands behind the projection 17 on the lock ing plate 14. Consequently if the key is now withdrawn from the knob, the spring 21 will keep the locking plate 14 in engaged position with the lug 18, so that neither knob can be turned.

The tumbler member 11 is of cylindrical form and has a radial projection 11a which is movable according as the tumbler plate is reeiprocated into and out of the path of a stop member 22 which is rigid on a stem 23, which stem carries a turnable thumbpiece and locking member 24.

Byv referring to Fig. 2, it will be seen that when the lug 11a is thrust inwardly by the tumbler 10, it registers with the slotted wall of the casing 4 (Fig. 4) thereby preventing the rotation of the knobs A-B, and also prevents reeiprocation of stop 22 which normally lies in the same slot receiving the projection 11a. Thus the thumb-piece 24 cannot be pushed toward the spindle 2 unless itis iirst pull-ed sutliciently to carry the stop 22 out of line with the interposed projection 11a. The stop member 22 and stem 23 move back and forth with the latch vbolt 5 and also have a limited movement transversely of the latch bolt, so that the stop member 22 may be carried into or out of engagement with the tumbler 11. For this purpose the stem 23 has a sliding movement in, and crosswise of, the latch bolt 5, and the stem is made polygonal to work in a corresponding guide in the latch bolt so that the member 22 cannot turn. A spring 25 encircling a fixed guide pin 26 acts on the stop member 22 to project the latter outwardly into opposed position to the tumbler projection 11a, as shown in Fig. 2; but, as represented in Fig. 1, the spring and the space allowed within the lock permit the stop member 22 to be moved inwardly, as shown in Fig. 1, whenever the thumbhold 24 is grasped and pulled outwardly, as shown. One side of the barrel 4 is slotted lengthwise, as is likewise the side of the door, to accommodate the stem 28 as the latch bolt moves back and forth. j

The thumb-piecey 24 carries a latch member 27 which is adapted to engage a notch 28 in the face plate of the lock, when turned in dotted line position, Fig. 1, and as represented in Fig. 2, so as to prevent the latch bolt 5 being moved. When the latch 27 is caught in the notch 28 it is impossible to turn the knob, even if the tumbler plate is in the unlocked position of Fig. 1.

The tumbler plate 10 and its locking plate 14 are suitably inc ased by a sleeve 29 surrounding the outside portion of the knob shank.

In operation, the parts being suitably assembled in a door, the lock is worked as follows: Ordinarily, where it is desired to operate the latch by means of the knobs, the key 12 is turned so as to release the locking plate 14 from the locking lug 18 and reciprocate the tumbler plate so as to withdraw the tumbler catch 11a into the space 30 in the door casing and out of the path of the stop member 22 on the latch bolt. Also, the thumb-piece 24 is drawn outward to disengage the catch 27 from its seat 28 and turned into full line position of Fig. 1. Then it is possible to work the latch by turning the knob. lf the thumb-piece 24 is turned so that the catch 27 is engaged with the hole 28, as shown in Fig. 2, then it is impossible either to turn the knob or retract the bolt. i

If it is desired to lock the door from the outside, the key is turned to throw the tumbler plate inwardly and carry the projection 11a into the path'of the stop member In this ease the knob cannot be turned because of the projection 11a engaging the stop member, but the latch can be retracted from the inside by simply pulling out on the thumbpiece 24 so that the stop 22 will be cai'- ried past the end of the tumbler when the latch is pushed back by turning the knob, as shown in Fig. 1. Thus the latch can always be worked from the inside, no matter whether the door is locked or not; while the knob can not be turned to open the door, either when the door is locked, or when the latch 27 is engaged with its keeper 28.

In Fig. 7, we have shown a modification in which a simple form of tumbler block 10 is employed, which is shifted back and forth to carry the tumbler member 11b into and out of the path of the stop member 22 on the latch bolt.

It is manifest or possible that the construction herein snecitied may be varied without departing from the principle of the invention, and we desire it to be understood that the invention is not limited to any specific form or arrangement of parts, except in so far as such limitations or their mechanical equivalents are specified in the claims.

Having thus described our invention, what we claim and desire to secure by Letters Patent is- 1. In a lock, the combination of a reciproca-ting latch bolt, means including a. knob and its spindle for actuating the latch bolt, a key, said knob having a radially extending key hole, a tumbler carried by the knob spindle and operated by the key, a turnable thumb piece and a stop member carried thereby and movable into range of action of the tumbler and adapted to prevent the operation of the latch bolt by the-knob.

2. In a lock, the combination of a reciprocating latch bolt, a knob having a knob spindle to actuate the latch bolt, a key, the knob having a radially extending keyhole, a tumbler carried by the knob spindle and operated by the key, said tumbler interposed in the path of stop means on the latch bolt to prevent the operation of the latter by theknob, and means connected with said stop on the latch bolt to disengage the latter from the tumbler independent of the key.

3. In a lock, the combination of a reciprocating latch bolt, means including a knob and a knob shank for operating the latch bolt, a tumbler member mounted in and slidable lengthwise of the knob spindle, and a stop member carried by and movable crosswise of the latch bolt and engageable with said member to prevent the actuation of the latch bolt.

4. In a lock, the combination of a reciprocating latch bolt, means including a knob, a knob spindle and a roll-back for actuating the latch bolt, a tumbler member slidable lengthwise of the knob spindle, a key for operating the tumbler, said knob having a key hole through which a key is passed to actuate the tumbler, and a stop member carried by the latch bolt and arranged parallel therewith and movable into the range of ac tion of the tumbler, and adapted to be engaged by the tumbler, to prevent the operation of the latch bolt by the knob.

V combination of a reciprocating latch bolt, means including a knob, a knob spindle and a roll back for actuating the latch bolt, a tumbler member slidable lengthwise of the knob spindle, a stop member carried by and movable crosswise of the latch bolt and engageable with said tumbler to prevent the actuation of the latch bolt by the knob, a key operating through the knob for actuating the tumbler, a i'xed member on the knob shank, and a locking member carried by the tumbler and engageable and disengageable with said fixed member.

6. In a lock, the combination of a reciprocating latch bolt, a knob and a knob spindle operative on the latch bolt to actuate the latter, a tumbler member slidable lengthwise of the knob shank, means on the latch bolt engaging with the tumbler member to prevent the actuation of the latch bolt, and a key for operating the tumbler, said mentioned means on the latch bolt including a stop member carried thereby and movable crosswise of the latch bolt.

In a lock, the combination of a reciprocating latch bolt, means including a knob and a knob spindle engageable with the latch bolt to operate the latter, a tumbler' member carried by the knob spindle and movable lengthwise thereof, and a stop member carried byand movable crosswise of the latch bolt and engageable with said tumbler.

8. In a lock, the

combination of a reciprocating latch bolt,

means including a knob and a knob spindle engageable with the latch bolt to operate the latter, a tumbler member carried by the knob spindle and movable lengthwise thereof, a stop member carried by and movable crosswise of the latch bolt and engageable with said tumbler, said stop member having a thumb-piece, and means coperatingA therewith to limit the movement of the latch bolt.

In testimony whereof we have hereunto set our hands in presence of two subscribing witnesses.

WILLIAM JOSEPH C. THORPE. M. THORPE. 

